Combined exhauster and tar extractor



Sept. 22, 1925. 1,554,726v

P. HOFFMAN couaman sxumswn AND TAR summon Filed uarch 21, 192.4

' .INVENTOR Pauifira, an.

Patented Sept. 22, 1925.

@UNITED' STATES 1 J a A 1,554,725 PATENT. OFFICE.

PAUL HoEEMAN, OF EAST ORANGE; NEw JEEsEY, nssreNon T0 INsEnsoyLL-EANn COMPANY, or ERSEY CITY, NEW JERSEY, AcoR-roEA'rIoNoE NEW JERSEY.

ooMEINED EXHAUSTEE AND ma Extra-acres.

Application filed March 21, 1924. SerialNo. 700,764.

To all whom it mag concern Be it known that I, PAULI'IOFFMAN, a citizen of the United States, and a resident of East Orange, county of Essex, andState of New Jersey, have invented a certain Gombined Exhauster and Tar Extractor, of which the following is a specification accompanied by drawings.

This invention relates to an apparatus, such as centrifugal blowers and the like, and includes features of general application which have special advantage when applied to exhausting gaseous fluids having in suspension liquids or semi-solid substances, which it is desired to separate therefrom.

In exhausting the products produced by the destructive distillation of coal, it is new ally found that a certain amount of tar is carried off with the gas. Such substances are found to bevery troublesome in that they are apt to separate from the gas and clog up conveying pipe lines. It is an ob ject of this invention to separate and extract tar or similar substances from the gas during the exhausting of the gas from the dis tilling apparatus,

The invention will be more clearly understood by reference to the drawing, in which there is shown an improved form which the invention may assume in practice. The drawing is a longitudinal sectional elevation of a blower or exhauster in which the apparatus forseparating coal tarvfrom the gas is included as an integral element.

The exhauster is preferably of the centrifugal blower type in which a revolving shaft A provided with a pair of impeller blades B and C adapted to revolve between suitable shrouds D to exhaust gas from a conduit E and to deliver it under pressure into a conduit F. A casing G for the blower is formed integrally with the shrouds D and provided with an inlet H leading to the intake J from which the impeller B draws the gas and expels it through a diffuser K into an intermediate chamber L, and thence to second stage impeller G by which it is forced through a diffuser 0 into the outlet chamber P and through the exhaust Q to the conduit F. The shaft A is provided with suitable bearings R supported by the casing, and a flange S for connection to a suitable driving element (not shown). Labyrinth seals T prevent the escape of gas exhausting to atmosphere between the casing and the shaft A. p I p A chamber U collects the gas escaping from the inlet chamber J past the shaft and an aperture V is adapted to relieve the pressure in this chamber. Asuitable pipe V may be employed to conduct the gas back to. the inlet H; A druin-orpiston W keyed to the shaft A is adapted to counteract the thrust due to unbalanced pressures on the impellers B and C. A chamber X closed at one end by the piston IV collects gas leaking by the drum IV. The pressure in the chamber X acts against the piston W to counteract the unbalanced thrust of the impellers B and C and this pressure may be regulatedby means of an aperture Y whichmay be connected by suitable piping Y adapted to convey such gas back into the inlet H.

As the gas is drawn from the inlet I-I it-is'expelled with great velocity through the diffuser IQ into the chamber L. In its passage through the intake H, impeller B and diffuser K,the gas flows at a high ranged in this mannerthe baffles Z lie across the path of the current so that the particles of tar are. most likely to be deposited on the face thereof. In order to prevent tar deposited on the walls of the chambers L from again intermingling with the gas, a heading D is formed around the inner edge of an inclined wall D of the shrouds D and is adapted to lead the tar around the intake side of the impellers C.

In addition the chambers L are in effect settling chambers in which a tar bearing gas is slowed down to a low velocity at which the tar may also be dropped collect ing on either the baffles Z or dropping directly to the bottom of the chamber at which there is provided an aperture a leadingrto a sump b. A suitable pipe 0 may be provided to draw ofi' the tar at suitable intervals.

From the chamber L the gas is drawn by the second stage impeller C by which it is forced under pressure through the diffuser In the chamber P the blades d are also arranged so as to be transverse to the line of flow of the gas emerging from the diffuser O. The greater part of this gas will therefore comein contact with the bladesd and deposit thereon such tar as may have remained in suspension.- The tar collected on the blades 03 will then drop to the bottom of the chamber P and pass out through an aperture 6 into a sump f from which it maybe drawn through a pipe 9. The gas thus purified of the tar is then free to pass out into the outlet Q. and into the conduit F.

I claim:

1. A combined eXhauster and tar extractor, comprising a. centrifugal blower provided with a diffuser and a settling chamber formed integrally with said diffuser, baffles in said chamber for intercepting particles of tar, and-means for leading the tar around the outlet opening of the chamber.

2. A combined exhauster and tar ,ex tractor, comprising a centrifugal blower having a diffuser, a settling chamber formed integrally with said diffuser, baffles in said settling chamber to lower the velocity of gas therein to a'minimum, and for collecting tar particles from the gas, and means to prevent the tar from flowing across the outlet opening of the chamber.

3. A combined exhauster and tar extractor, comprising a centrifugal blower having a diffuser, a settling chamber formed integrally with said diffuser, and means in said settling chamber to lower the velocity .of gas therein, includingblades extending across said settling chamber to collect particles of tar from said gas by contact there with, and a beading in said chamber to prevent the tar from flowing across the outlet opening of said chamber. t

4. A combined exhauster and tar extractor, comprising a two stage blower having diffusers, asettling chamber intermediate the two stages of said blower integrally formed with said diffusers, an outlet chamber from the second stage and blades arranged in said settling chamber and said outlet chamber transverse to the direction of flow of gas therein to collect particles of tar from the gas by contact; therewith, sumps to collect the tar deposited on said blades, and a heading, around the outlet opening of said settling chamber to prevent tar from flowing across said opening. r

5. A combined exhauster and tar extractor, comprising a centrifugal blower having a diffuser, a settling chamber of relatively large cross sectional area associated with said diffuser for lowering the velocity of gas through said chamber, baffles in said chamber for controlling the direction of flow of gas and for collecting particles of tar from the gas, and a beading in said chamber to lead the tar around the outletof said chamber. ,6. A combined exhauster and tar extractor, comprising a centrifugal blower having a diffuser, a settling chamber of relatively large cross sectional area associated with said difl'user for lowering the velocity of gas through said chamber, baffles arranged radially in said chamber for controlling the direction of' flow of gas therethrough and for intercepting particles of tar, a beading in said chamber for directing accumulated tar. around the outlet of the chamber, and a sump to receive the tar from said chamber. A

In testimony whereof I have signed this specification. I

PAUL HOFFMAN. 

